Patents by Inventor Leonard Dogniez

Leonard Dogniez has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Dynamically vulcanized alloys of crystalline polyolefin resin and halobutyl rubber material
    Patent number: 5021500
    Abstract: Thermoplastic polyolefin (TPO) compositions which have superior long-term heat aging characteristics are prepared by blending a crystalline thermoplastic resin with a halobutyl rubber under conditions of dynamic vulcanization and in the presence of a maleimide curative.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: June 4, 1991
    Assignee: Exxon Chemical Company
    Inventors: Robert C. Puydak, Donald R. Hazelton, Silvestro Cartasegna, Leonard Dogniez